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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style type="text/css">
        div:first-child{
            font-style: italic;
        }
        div:nth-child(2)
        {
            font-weight: 900;
        }
        div:nth-child(3){
            font-size: 50px;
        }
        div:nth-child(4){
            font-family: "华文行楷";
        }
        div:nth-child(5){
            /* font-size: 50px; */
            font:italic bold 50px "华文行楷";
        }
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</head>
<body>
    <div>123一二三</div>
    <div>123一二三</div>
    <div>123一二三</div>
    <div>123一二三</div>
    <div>123一二三</div>
</body>
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